Installation instructions Condensing gas boiler Logamax plus...Condensing gas boiler Logamax plus CAUTION! Before putting the boiler into oper ation read this manual carefully. DANGER!

Read carefully before carrying out installation and maintenance.

Installation instructions

Condensing gas boiler

Logamax plus

CAUTION!Before putting the boiler into operation read this manual carefully.DANGER!Improper installation, adjustment, alteration, service or maintenance can cause injury, loss of life or property damage. Refer to this manual. For assistance or additional information consult a qualified installer, service agency or the gas supplier.CAUTION!The operating manual is part of the documentation that is delivered to the installation's operator. Go through the information in this manual with the owner/operator and make sure that he or she is familiar with all the necessary operating instructions.

Notice!• This manual is available in the English and French language.• This manual must be retained for future reference.

6720649345-02.0N

Danger: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.• Do not store or use gasoline or other flammable vapors and liquids

in the vicinity of this or any other appliance.• What to do if you smell gas:

– Do not try to light any boiler.– Do not touch any electrical switch; do not use any phone in your

building.– Immediately call your gas supplier from a neighbor’s phone.

Follow the gas supplier’s instructions.– If you cannot reach your gas supplier, call the fire department.

• Installation and service must be performed by a qualified installer, service agency or the gas supplier.

GB142-24GB142-30GB142-45GB142-60

6720

8201

04 (2

017/

10) U

S/CA

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

About these instructions

2

About these instructionsThese Installation Instructions contain important information for the safe and professional installation, start-up and maintenance of the boiler with boiler capacities 24, 30, 45 and 60 kW.These Installation Instructions are intended for professional installers, who have the necessary training and experience for working on heating and gas systems.

Subject to technical changesSlight changes may be made to the illustrations, process steps and technical data as a result of our policy of continuous improvement.

Updating of documentationPlease contact us if you have any suggestions for improvements or corrections.

Table of contents

1 Safety and general instructions . . . . . . . . . . . . . . . . . . . . . . . . . 31.1 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.2 Hazard definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.3 The following instructions must be observed . . . . . . . . . 31.4 Observe these instructions for space heating water . . . . 41.5 Tools, materials and additional equipment . . . . . . . . . . . 41.6 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2 Regulations and guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Dimensions and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5 Packaging and transportation . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

6 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.1 Requirements for the installation room . . . . . . . . . . . . . . 96.2 Fitting the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.3 Making the gas connection . . . . . . . . . . . . . . . . . . . . . . 106.4 Fitting the heating circuit supply and return pipes . . . 106.5 Combustion Air and Ventilation Openings . . . . . . . . . . 136.6 Installation of the flue gas adapter (included in the

scope of delivery) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136.7 Installation of the Exhaust and Air Intake system . . . . 146.8 Conversion to Propane . . . . . . . . . . . . . . . . . . . . . . . . . 18

7 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187.1 External connection board connections . . . . . . . . . . . 18

8 Start-up procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.1 Testing for gas leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . 228.2 Filling the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228.3 Filling the condensate trap . . . . . . . . . . . . . . . . . . . . . . 228.4 Bleeding the gas supply valve . . . . . . . . . . . . . . . . . . . . 228.5 Checking the combustion air/flue gas connection . . . 228.6 Checking the orifices . . . . . . . . . . . . . . . . . . . . . . . . . . . 228.7 Inlet gas pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238.8 Checking and adjusting the gas/air ratio . . . . . . . . . . . 238.9 Carrying out a leak test in operating conditions . . . . . 248.10 Measuring the carbon monoxide content (CO) . . . . . . 248.11 Function testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

8.12 Measuring the ionization current . . . . . . . . . . . . . . . . . . 248.13 Testing the Ignition Safety shut off device . . . . . . . . . . 258.14 Installing the casing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258.15 Informing the owner, handing over the technical

documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

9 BC10 basic controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259.1 Operating the BC10 basic controller . . . . . . . . . . . . . . . 259.1.1 Switching the heating system on and off . . . . . . . . . . . . 269.1.2 Displaying the operating conditions of the burner

and resetting the burner or resetting burner faults . . . 269.1.3 Displaying the heating system status and/or faults . . . 269.2 Carrying out additional tasks . . . . . . . . . . . . . . . . . . . . . 279.2.1 Carrying out a flue gas test . . . . . . . . . . . . . . . . . . . . . . . 279.2.2 Selecting partial load operation (e. g. during flue

gas testing) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279.2.3 Switching the heating system to manual mode . . . . . . . 279.3 Configuring the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . 279.3.1 Adjusting the heating capacity . . . . . . . . . . . . . . . . . . . . 279.3.2 Setting the DHW temperature value . . . . . . . . . . . . . . . 289.3.3 Entering the space heating water temperature . . . . . . . 289.3.4 Setting the pump post-purge period . . . . . . . . . . . . . . . 28

10 Shutting down the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2810.1 Shut down the heating system using the control unit . . 2810.2 Shutting down the heating system in the event of

an emergency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

11 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2911.1 Preparing the boiler for inspection . . . . . . . . . . . . . . . . 2911.2 Visual inspection for general signs of corrosion . . . . . . 2911.3 Internal leak testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2911.4 Measuring the ionization current . . . . . . . . . . . . . . . . . . 2911.5 Measuring the inlet gas pressure . . . . . . . . . . . . . . . . . . 2911.6 Checking and adjusting the gas/air ratio . . . . . . . . . . . . 2911.7 Carrying out a gas leak test in operating conditions . . . 2911.8 Measuring the carbon monoxide content (CO) . . . . . . . 2911.9 Carrying out a pressure test of the heating system . . . . 2911.10 Checking the functioning and the safety of the

air intake and flue gas conduit . . . . . . . . . . . . . . . . . . . . 2911.11 Checking venting systems . . . . . . . . . . . . . . . . . . . . . . . 29

12 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2912.1 Cleaning the heat exchanger, burner and

condensate trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2912.2 Checking and adjusting the gas/air-ratio . . . . . . . . . . . . 31

13 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3113.1 Operating messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3113.2 Error messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3213.3 Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . 33

14 Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3414.1 Start-up report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3414.2 Inspection report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3514.3 Maintenance report . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

15 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

1 Safety and general instructions

3

1 Safety and general instructionsPlease observe these instructions in the interest of your own safety.

1.1 Designated useThe boiler was designed for heating water for a central heating system and generating domestic hot water.The boiler is delivered with a BC10 basic controller and the “Universal Automatic Burner Control Unit 3” (UBA 3) pre-installed.The boiler can be fitted with a modulating outdoor reset control AM10 (scope of delivery), a room controller RC10 (optional), or an On/Off thermostat or relay panel end switch (accessories).

1.2 Hazard definitionsThe following defined terms are used throughout the documentation to bring attention to the presence of hazards of various risk levels. Notices give important information concerning the operation of the product.

1.3 The following instructions must be observed• The boiler must only be used for its designated

purpose, observing the Installation Instructions.• Only use the boiler in the combinations and with the

accessories and spares listed.• Other combinations, accessories and consumables

must only be used if they are specifically designed for the intended application and do not affect the system performance and the safety requirements.

• Maintenance and repairs must only be carried out by trained professionals.

• You must report the installation of a condensing gas boiler to the relevant gas utility company and have it approved.

• You are only allowed to operate the condensing gas boiler with the combustion air/flue gas system that has been specifically designed and approved for this type of boiler.

• Please note that local permission for the flue system and the condensate water connection to the public sewer system may be required.

You must also observe:• the local building regulations stipulating the

installation rules.• the local building regulations concerning the air

intake and outlet systems and the chimney connection.

• the regulations for the power supply connection.• the technical rules laid down by the gas utility

company concerning the connection of the gas burner fitting to the local gas main.

• the instructions and standards concerning the safety equipment for the water/space heating system.

• the Installation Instructions for building heating systems.

• The boiler must be located in an area where leakage of the tank or connections will not result in damage to the area adjacent to the boiler or to lower floors of the structure. When such locations cannot be avoided, it is recommended that a suitable drain pan, adequately drained, be installed under the boiler. The pan must not restrict combustion air flow.

• The boiler must be installed such that the gas ignition system components are protected from water (dripping, spraying, rain etc.) during boiler operation and service.

• The boiler must not be installed on carpeting.• Do not restrict or seal any air intake or outlet

openings.• If you find any defects, you must inform the owner

of the system of the defect and the associated hazard in writing.

DANGER: Indicates the presence of hazards that will cause severe personal injury, death or substantial property damage.

WARNING: Indicates the presence of hazards that can cause severe personal injury, death or substantial property damage.

CAUTION: Indicates presence of hazards that will or cause minor personal injury or property damage.

CAUTION: Risk of electrical shockIndicates presence of hazards due to electric shock.

NOTICE:▶ Indicates special instructions on

installation, operation or maintenance that are important but not related to personal injury or property damage.

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

2 Regulations and guidelines

4

1.4 Observe these instructions for space heating waterUnsuitable heating system water can promote the formation of scale or sludge, which affects system efficiency. It can also cause corrosion and reduce life of the heat exchanger.• You must follow Buderus guidelines for boiler water

quality.• Thoroughly flush the system prior to filling.• Use of a Buderus approved boiler cleaner is

recommended.• Never use salt bedding exchangers to soften the

water.• Do not use inhibitors or other additives unless

approved by Buderus for that purpose!• When frost protection of the heating system is

desired, only use Buderus-approved Aluminum-safe antifreeze.

• When using oxygen-permeable pipes, e. g. for floor heating systems, you must separate the system using heat exchangers.

• The maximum permissible flow rate of the GB142-24/30 this is 11 GPM (gal./min.)(= 42 l/min.), for the GB142-45 is 15 GPM (= 57 l/min.) and for the GB142-60 is 20 GPM (= 76 l/min.).

1.5 Tools, materials and additional equipmentFor the installation and maintenance of the boiler you will need the standard tools for space heating, gas and water fitting.In addition, a handtruck with a fastening belt is useful.

1.6 Disposal• Dispose of the boiler packaging in an environmentally sound manner.• Dispose of components of the heating system (e. g. boiler or control

device), that must be replaced in an environmentally responsible manner.

2 Regulations and guidelinesThe installation must conform to the requirements of the authority having jurisdiction or, in the absence of such requirements, to the latest edition of the National Fuel Gas Code, ANSI Z223.1. In Canada, installation must be in accordance with the requirements of CAN/CSA B149.1, Natural Gas and Propane Installation Code.Where required by the authority having jurisdiction, the installation must conform to the Standard for Controls and Safety Devices for Automatically Fired Boilers, ANSI/ASME CSD-1.Install CO detectors per local regulations. Boiler requires yearly maintenance, see maintenance section see chapter 12 “Maintenance”, page 29.

Operating Limits of the boilerMax. boiler temperature: 230 °F (110 °C)Max. operating pressure: 44 psi (3 bar)The hot water distribution system must comply with all applicable codes and regulations. When replacing an existing boiler, it is important to check the condition of the entire hot water distribution system to ensure safe operation.

Massachusetts Installations Only(a) For all side wall side horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied:• INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of

installation of the side wall horizontal vented gas fueled equipment, the installing plumber or gas fitter shall observe that a hard wired carbon monoxide detector with an alarm and battery back-up is installed on the floor level where the gas equipment is to be installed. In addition, the installing plumber or gas fitter shall observe that a battery operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling, building or structure served by the side wall horizontal vented gas fueled equipment. It shall be the responsibility of the property owner to secure the services of qualified licensed professionals for the installation of hard wired carbon monoxide detectors.– In the event that the side wall horizontally vented gas fueled

equipment is installed in a crawl space or an attic, the hard wired carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent floor level.

– In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner shall have a period of thirty (30) days to comply with the above requirements; provided, however, that during said thirty (30) day period, a battery operated carbon monoxide detector with an alarm shall be installed.

DANGER: if flammable gas explodes.Beware if you smell gas: there may be an explosion hazard!Warning: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death.▶ Do not store or use gasoline or other

flammable vapors and liquids in the vicinity of this or any other boiler.

What to do if you smell gas:▶ Do not try to light any boiler.▶ Do not touch any electrical switch; do

not use any phone in your building.▶ Immediately call your gas supplier from

a neighbor’s phone. Follow the gas supplier’s instructions.

▶ If you cannot reach your gas supplier, call the fire department.

Installation and service must be performed by a qualified installer, service agency or the gas supplier.

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

3 Product description

5

• APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as required in accordance with the above provisions shall comply with NPA 720 and be ANSI/UL 2034 listed and IAS certified.

• SIGNAGE. A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment. the sign shall read, in print size no less than one-half (½) inch in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”.

• INSPECTION. The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the installation unless, upon inspections, the inspector observes carbon monoxide detectors and signage installed in accordance with the provisions of 248 CRM 5.08(2)(a)1 through 4.

(b) EXEMPTIONS: The following equipment is exempt from 248 CRM 5.08(2)(a)1 through 4:• The equipment listed in Chapter 10 entitled “Equipment Not

Required To Be Vented” in the most correct edition of NFPA 54 as adopted by the board: and

• Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from the dwelling, building or structure used in whole or in part for residential purposes.

(c) MANUFACTURES REQUIREMENTS - GAS EQUIPMENT VENTING SYTEM REQUIRED.

When the manufacturer of Product Approved side wall horizontally mounted gas equipment provides a venting system design or venting system components with the equipment, the instructions provided by the manufacturer for the installation of the equipment and venting shall include:• Detailed instructions for the installation of the venting system or the

venting system components: and• A complete parts list for the venting system design or venting system.(d) MANUFACTURES REQUIREMENTS - GAS EQUIPMENT VENTING SYTEM NOT PROVIDED.When the manufacturer of Product Approved side wall horizontally vented gas fueled equipment does not provide the parts for the venting of flue gases, but identifies “special venting systems”, the following requirements shall be satisfied by the manufacturer:• The referenced “special venting systems” shall be included with the

appliance or equipment installation instructions: and• The “special venting systems” shall be Product Approved by the

Board, and the instructions for that system shall include a parts list and detailed installation instructions.

(e) A copy of all instructions for all Product Approved side wall horizontally vented gas fueled equipment, all venting instructions, all parts lists for venting instructions, and/or venting design instructions shall remain with the appliance or equipment at the completion of the installation.


Fig. 1 Logamax plus GB142-24/30 (left) and GB142-45/60 (right)

[1] Drawer with control unit[2] Universal Burner Automat (UBA3)[3] Control unit BC10[4] Gas valve[5] Cover[6] Flue measuring points[7] Parallel flue[8] Burner

[9] Latches of which two have locks[10] Sighting glass[11] Heat exchanger[12] Back cover[13] Air intake for the fan[14] Fan[15] Condensate trap and internal condensate drain flue gas pipe[16] External Connection Board (under the cover)[17] Pressure sensor

72150200-1.1TD

5

6

4

2

1

3

5

4

2

1

3

14 16 16

9

12

13

9

10

11

13

17

6 7

8

9

12

9

10

11

7

8

14 1515

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)


6

Fig. 2 Basic Controller Logamatic BC10

[1] Main switch[2] DHW temperature knob1)

[3] LED “DHW status”[4] Display[5] Space heating water temperature knob[6] LED “Heating system status”[7] Under the cover a RC system controller can be installed[8] LED “Burner Operation”[9] Service Tool connector[10] “Service” e button[11] “Chimney sweep” d button[12] “Reset” c button[13] Air intake for the fan

72150200-2.1TD

190

170

150

130

90

110

140

130

120

90

100110

54

1011121 8

6

79

2 3

1) ECO mode means that the temperature inside the hot water tank is 140 °F (60 °C), with a hysteresis (ΔT) of 18 °F (10 °C) instead of 9 °F (5 °C)

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

4 Dimensions and connections

7


Fig. 3 Dimensions and connections for boiler GB142-24/30 (dimensions in inches)

[A] (AA) Flue gas connection (inside diameter 3")[B] (LA) Air intake (inside diameter 3")[C] (WB) Wall bracket[D] (GAS) diameter Gas connection, ¾" NPT[E] (AKO) Condensate water outlet, Ø 1.3" (Ø 32 mm) outside[F] (VK) Supply, Ø 1.0" 1) (Ø 25.4 mm)[G] (RK) Return, Ø 1.0" 1) (Ø 25.4 mm)

72150200-3.1TD

4" (1

00 m

m)

12" (300 mm)

20" (500 mm)

6.2"(158 mm)

0.25"(6 mm)

1.8" (46 mm)

18.7" (475 mm)

> 6"(150 mm)

2.2"

(55

mm

)

3" (7

5 m

m)

3" (7

5 m

m)

6" (1

50 m

m)

1.2"

(30

mm

)

16" (420 mm)7.5"

(190

mm

)28

" (71

2 m

m)

5.5" (239 mm)

4.3" (110 mm)13.2" (335 mm)22" (560 mm)

3" (75 mm)

> 4"(100 mm)

6" (1

50 m

m)

D E F G

A B

C

1) One Ø 1.0" (Ø 25.4 mm) inside x 1" NPT threaded compression fitting is delivered enclosed with boiler packaging

Observe the lateral minimum distances of the boiler (12" = 300 mm) and the necessary distances (24" = 600 mm) at the front and 4" (100 mm) at the top for removing the casing and for servicing. Closet clearances are: 4" (100 mm) to the right, 4" (100 mm) at the top and 6" (150 mm) to the left.

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)


8

Fig. 4 Dimensions and connections for boiler GB142-45/60 (dimensions in inches)

[A] (AA) Combustion air[B] (LA) Air intake[C] (WB) Wall bracket[D] (GAS) Gas connection, ¾" NPT[E] (AKO) Condensate water outlet, Ø 1.3" (Ø 32 mm)[F] (VK) Supply, Ø 1.0" 1) (Ø 25.4 mm)[G] (RK) Return, Ø 1.0" 1) (Ø 25.4 mm)

72150200-4.1TD

20.7" (526 mm)1.

2" (

30 m

m)

16" (420 mm)

7.5"

(19

0 m

m)

28"

(712

mm

)

5.5" (239 mm)

4.3" (110 mm)13.2" (335 mm)35.4" (900 mm)

9.7" (246 mm)

> 6"(150 mm)

2.2"

(55

mm

)

3" (

75 m

m)

3" (

75 m

m)

D E F G

A B

C

6.2"(158 mm)

0.25"(6 mm)

1.8" (46 mm)

18.7" (475 mm)

4" (

100

mm

)

12" (300 mm)

20" (500 mm)

> 4"(100 mm)

1) One Ø 1.0'' (Ø 25.4 mm) inside x 1'' NPT threaded compression fitting is delivered enclosed with boiler packaging

Observe the lateral minimum distances of the boiler (12" = 300 mm) and the necessary distances (24" = 600 mm) at the front and 4" (100 mm) at the top) for removing the casing and for servicing. Closet clearances are: 4" (100 mm) to the right, 4" (100 mm) at the top and 6" (150 mm) to the left.

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

5 Packaging and transportation

9

5 Packaging and transportation

5.1 Scope of deliveryThe boiler is delivered fully assembled.▶ When receiving the delivery, check if the packaging is intact.▶ Check that all the items listed in fig. 5 are included in the delivery.

Fig. 5 Items supplied with unit (1 box)

[1] Boiler with casing[2] Wall bracket[3] Technical documents including: User's Instructions1), Installation

Instructions, wall mounting template and Servicing Instructions[4] Compression fittings (2x)[5] GB142 Boiler manifold including: low loss header, pressure relief

valve, tridicator, DHW connections, Grundfos 15-58 3-speed boiler circulator, supply and return shutoff ball valves

[6] AM10 with outdoor sensor[7] Propane conversion kit[8] Flue gas adapter[9] Boiler connection kit, including the DHW sensor

6 Installation

6.1 Requirements for the installation room

6.2 Fitting the boilerObserve the installation clearances of the combustion air/flue gas system.

▶ Remove the packaging materials and dispose of them.▶ Use the mounting template to mark the drill holes.▶ Install the wall bracket taking into account the necessary service

clearances.▶ Remove the transport safety clamps ( fig. 6).

Fig. 6 Removing the transport safety clamps

▶ Use the radiator key to unlock the two latches a quarter turn ( fig. 7, [1]).

▶ Open the latches ( fig. 7, [2]).▶ Remove the casing by lifting it upwards and then pulling it forwards

( fig. 7, [3]); do not hold the casing by the latches.

Fig. 7 Removing the casing1) The user’s instructions (in a special format) is located in the boiler drawer

72150200-5.1TD

9

1

35

4

87

2

6

DANGER: ▶ Install the heating system in a frost-free room.▶ Do not store any flammable materials or liquids in the

immediate vicinity of the boiler.▶ Never use any chlorinated detergents or halogenated

hydrocarbons (e. g. in spray cans, solvents and detergents, paints, adhesives).

▶ Do not allow too much dust to collect on the boiler.

NOTICE:▶ To protect the connection orifice you must not

remove the styrofoam bottom panel.▶ Do not lift the boiler by the drawer.▶ Do not remove the transport safety clamps ( fig. 6)

from the drawer at this time.▶ Protect the boiler and the combustion air/flue gas

orifice against pollution during installation.

72150200-6.1TD

72150200-7.1TD

1.

2.

2.3. 2.

2.

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

6 Installation

10

▶ Hold the boiler by the rear boiler casing and place it on the wall bracket.

▶ Level out the boiler.

6.3 Making the gas connection

▶ Determine proper size gas pipe for the installation using table 1 and table 2. Do not forget the pipe fitting losses and observe proper size of the fittings.

▶ Install the ¾" gas cock on the gas connection.▶ Connect the gas pipe to the gas cock ( fig. 8, [1]) so that it is free

from any strain

Fig. 8 Making the gas connection

A sediment trap must be provided upstream of the gas controls.

6.4 Fitting the heating circuit supply and return pipes

▶ Fit a filling and drain cock in the heating system supply pipe if required.

▶ Also fit an adequately sized safety valve in the system that meets all applicable codes and regulations.

▶ Thoroughly flush all pipes and radiators. Use of a Buderus approved boiler cleaner is recommended.

▶ Refer to the installation template for the pipe connection dimensions.

▶ Fit the compression fittings ( fig. 9, [1] and [2]) first to the Hydronic set ( fig. 10, 11 and 12) and then to the boiler.

Fig. 9 Pump manifold installation

[1] Compression fitting (heating system supply pipe)[2] Compression fitting (heating system return pipe)

DANGER: Only carry out work on gas lines if you are licensed for such work.

Length of pipe (feet)

Gas Volume Capacity (ft3 / hr) 1)

1) Maximum pipe capacity in ft3/hr, based on a specific gravity of .60 (42 mbar) and a inlet gas pressure of 14 inches W.C. (35 mbar) or less and a pressure drop of 3 inches W.C. (20 mbar)

¼ " 1" 1 ¼ " 1 ½ "10 278 520 1,060 1,60020 190 350 730 1,10030 152 285 590 89040 130 245 500 76050 115 215 440 67075 93 175 360 545100 79 160 305 480150 64 120 250 380

Table 1 Gas Pipe Capacity for different pipe sizes

Steel pipe diameter in inches

Equivalent length for Pipe Fittings in feetType of pipe fitting

90°-Elbow Tee (flow thru branch)

Gate valve Gas cocks

Equivalent length in feet¾ 2.1 4.1 0.5 1.251 2.6 5.2 0.6 1.601 ¼ 3.5 6.9 0.8 2.151 ½ 4.0 8.0 0.9 2.50

Table 2 Equivalent length for pipe fittings in feet

72150200-8.1TD

1

NOTICE:▶ When installing the gas supply connection, it must

comply with local regulations or, if such regulations do not exist, with the National Fuel Gas Code, ANSI Z 223.1. In Canada, the gas supply connection must comply with local regulations or, if such regulations do not exist, with CAN/CSA B149.1, Natural Gas and Propane Installation Code.

NOTICE:▶ To protect the entire heating system we require

installing a WYE strainer in the return circuit. When retrofitting the boiler to an existing heating system this filter is required.

▶ Install shut-off valves immediately before and after the dirt particle filter to allow the filter to be cleaned.

NOTICE:▶ When using oxygen-permeable pipes, e. g. for radiant

floor heating systems, you must separate the system using heat exchangers. Buderus recommends hydraulically isolating snowmelt systems using heat exchangers.

72150200-9.1TD

1 2

11 4

10

5

7

9

8

6

33

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11

[3] Di electric union[4] DHW return 1" FPT[5] Low loss header[6] Tridicator[7] System return 1½ MPT[8] System supply 1½ MPT[9] Drain valve[10] DHW supply 1" FPT[11] Relief valve▶ Connect the expansion tank to the system.▶ Connect the pipes so that they are free from strain.

Connecting boiler with DHW tank▶ Connect the external hot-water tank according to the Installation

instructions of the hot-water tank and fittings concerned.

Piping examples▶ The following illustrations are two Installation examples.

Piping and field components must be field verified.Fig. 10 is a schematic representation of fig. 9.

Fig. 10 Schematic representation of the boiler with the hydronic set

[1] Flue gas[2] Air intake[3] Pump manifold[4] DHW return 1" FPT[5] Low loss header[6] PT gauge (pressure and temperature gauge)[7] System return 1½ MPT[8] System supply 1½ MPT[9] Drain valve[10] Pump manifold shut-off valve[11] DHW supply 1" FPT

Relief valveThe indirect DHW tank must have a temperature and pressure relief valve installed. The relief valve shall comply with the Standard for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22-CSA 4.4.▶ Install the relief valve according fig. 10. The relief valve must comply

with following specifications:– dimensions: height 2¼ inch (57.15 mm), width 2 inch

(50.8 mm);– 30 Psi (2 bar) discharge pressure;– discharge is ¾ inch (19.1 mm) female in diameter.

Fig. 11 Schematic representation of the boiler with the hydraulic set connected to an optional hot water tank with one or multiple zones including one pump and zone valves

[1] Flue gas[2] Air intake[3] Optional DHW tank[4] Primary pump[5] Shut-off valve[6] PT gauge (pressure and temperature gauge)[7] Zone valve

NOTICE:▶ The following illustrations are simplified conceptual

illustrations only.

72150200-10.1TD

GB142GB142

PT

3

9

7

4

5

6

8

10

11

1 2

DANGER: If this boiler is installed in a closed water supply system with an external indirect DHW tank, such as one having a backflow preventer in the cold water supply line, means shall be provided to control thermal expansion.▶ Contact the water supplier or local plumbing

inspector on how to control this situation.

WARNING: No valve is to be placed between the relief valve and the tank. Discharge of the relief valve must be conducted to a suitable place for disposal when relief occurs and no reducing coupling or other restriction may be installed in the discharge line.

NOTICE:▶ For the maximum permissible flow rate of the DHW

pump see section 1.4, page 4.

72150200-11.1TD

GB142GB142

AdditionalDHWTank

PT

1

3

7

154

6

9

5

2

8

12

1314

16

1011

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[8] Radiant[9] Additional zones[10] Shut-off valve[11] Zones[12] Secondary pump[13] Drain valve[14] Low loss header[15] DHW pump[16] Pressure relief valve

Fig. 12 Schematic representation of the boiler with the Hydronic set connected to an optional hot water tank with one or multiple zones and zone pumps

[1] Flue gas[2] Air intake[3] Optional DHW tank[4] Primary pump[5] Shut-off valve[6] PT gauge (pressure and temperature gauge)[7] Zone pump[8] Radiant[9] Additional zones[10] Shut-off valve[11] Zones[12] Drain valve[13] Low loss header[14] DHW pump[15] Pressure relief valve

Low Water Cut-Off (LWCO) and External Manual Reset High LimitA hot water boiler installed above radiation level or as required by the Authority having jurisdiction, must be provided with an external Low Water Cut-Off (LWCO) and/or an External Manual Reset High Limit device, either as a part of the boiler or at the time of boiler installation.• Contractor to furnish and install LWCO and Manual Reset High Limit

devices as required by local codes.• Do not install any type of value or check valve in between boiler and

LWCO or Manual Reset High Limit.

• Refer to the manufacturer’s instructions when installing LWCO and Manual Reset High Limit.

• LWCO is installed external to the boiler and must be located above the highest point of the boiler heat exchanger.

• Manual Reset High Limit remote sensing bulb must be located in the boiler supply.

• In a cascade each boiler must be equipped with its own LWCO and Manual Reset High Limit.

▶ Remove the 1” plug and connect a 1" Tee at the back of the boiler manifold.

▶ Connect a 1" well for the Manual Rest High Limit probe [6] at the horizontal end.

▶ Install a 1" stand pipe that reaches above the highest point of the boiler heat exchanger at the vertical connector of the Tee.

▶ Install a second Tee with an automatic air vent [1] at the top and a LWCO [2] just below.

▶ Wire the LWCO [NC1] and the Manual Reset High Limit [NC2] normally closed dry contacts in series with EV pins 1 and 2 on the boiler, which will shut off the burner when the connection is interrupted.

Fig. 13 Low Water Cut-Off views(Note: Power supply to LWCO and external high limit not shown for clarity.)

[1] Automatic air vent[2] Low Water Cut-Off[3] Manual Reset High Limit[4] DHW Return[5] DHW Supply[6] Manual Reset High Limit probe

NOTICE:▶ Primary boiler pump must have an internal check

valve.

72150200-12.1TD

GB142GB142

AdditionalDHWTank

PT

1

3

7

144

65

2

811

1213

15

910

FW EV DWV

21 21 21 1

GRY RED LT. BLU

NC1 NC2

4

56

3

1 2

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6.5 Combustion Air and Ventilation OpeningsProvisions for combustion and ventilation air must be made in accordance with section 5.3, Air for Combustion and Ventilation, of the National Flue Gas Code, ANSI Z223.1, or Sections 7.2, 7.3 or 7.4 of CAN/CGA B149, Installation Codes, or applicable provisions of the local building codes.

All Air from Inside the Building (non sealed combustion)The closet shall be provided with two permanent openings communicating directly with an additional room(s). The total input of all gas utilization equipment installed in the combined space shall be considered in making this determination. Each opening shall have a minimum free area of 1 square inch per 1,000 Btu per hour of total input rating of all gas utilization equipment in the confined space, but no less than 100 square inches. One opening shall commence within 12 inches (305 mm) of the top, and one opening shall commence within 12 inches (305 mm) of the bottom of the enclosure. The minimum dimension of air openings shall be not less than 3 inches (75 mm).• Where directly communicating with the outdoors, each opening shall

have a minimum free area of 1 square inch per 4,000 Btu/hr of total input rating of all equipment in the enclosure.

• Where communicating with the outdoors through vertical ducts, each opening shall have a minimum free area of 1 square inch per 4,000 Btu/hr of total input rating of all equipment in the enclosure.

• Where communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch per 2,000 Btu/hr of total input rating of all equipment in the enclosure.

• Where ducts are used, they shall be of the same cross-sectional area as the free area of the opening to which they connect.

6.6 Installation of the flue gas adapter (included in the scope of delivery)

Before installing the exhaust and air intake system, it is necessary to remove the transport safety device and to install the flue gas adapter.

▶ Remove the transport safety device with the two screws ( fig. 14).

Fig. 14 Removing the transport safety device

▶ Remove the protective cap from the internal condensate bypass pipe. Place the flue gas adapter and connect the internal condensate bypass pipe ( fig. 15).

Fig. 15 Placing the flue gas adapter

CAUTION: BOILER DAMAGE AND OPERATIONAL FAILURES !Due to insufficient or lacking openings for combustion air and/or ventilation of the boiler room. Provisions for combustion air and ventilation are always required, regardless whether the combustion air is taken from the outside (sealed combustion) or inside (non sealed combustion for combustion). Insufficient ventilation of the boiler room can lead to high air temperatures. This can result in boiler damage.▶ Make sure that intake and exhaust openings are

sufficiently sized and no reduction or closure of openings takes place.

▶ When the problem is not resolved, do not operate the boiler.

▶ Please note these restrictions and its dangers to the operator of the boiler.

CAUTION: BOILER DAMAGE !Due to contaminated air.▶ Boiler must be clear and free from combustible

materials, gasoline and other flammable vapors and liquids, and corrosive liquids and vapors. Never use chlorine and hydrocarbon containing chemicals (such as spray chemicals, solution and cleaning agents, paints, glues etc) in the vicinity of the boiler.

▶ Do not store and use these chemicals in the boiler room.

▶ Avoid excessive dust formation and build-up.

NOTICE:▶ When one expects contaminated combustion air

(near swimming pools, chemical cleaning operations and hair salons), sealed combustion operation is recommended.

DANGER: FIRE DANGER !Due to flammable materials or liquids.▶ Do not store flammable materials and liquids in the

immediate vicinity of the boiler.

NOTICE:▶ Before installing the exhaust and air intake system, it

is necessary to remove the transport safety device and to install the flue gas adapter.

72150200-13.1TD

72150200-14.1TD

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▶ Screw on the flue gas adapter using 6 screws ( fig. 16).

Fig. 16 Connecting the flue gas adapter

6.7 Installation of the Exhaust and Air Intake system

An optional concentric vent/air intake body ( fig. 17 and 18) can be used for the installation of a vertical venting system as well as for a horizontal venting system. The concentric vent/air intake body can be ordered by Buderus Hydronic Systems, part no. BRYKGAVTO601CV. Other optional vent kits are:383-500-397 Plastic Vent Kit

Fig. 17 Vertical venting system (sealed combustion)

[1] Exhaust 3" (80 mm)[2] 10"- 0" min. (250 mm - 0 mm min.)

[3] 12" (300 mm) over maximum snow level or 24" (600 mm) whichever is greater

[4] Intake 3" (80 mm)[5] 3" × 1.5" (80 × 38.1 mm)

Fig. 18 Horizontal venting system (sealed combustion)

[1] Exhaust 3" (80 mm)[2] Intake 3" (80 mm)[3] 24" max. (610 mm max.)[4] 3" × 1.5" (80 × 38.1 mm)The boiler can also be operated with separate air intake and exhaust piping ( fig. 18 and fig. 19).

Fig. 19 Horizontal venting system (non sealed combustion only) - Situation 1

[1] Exhaust 3" (80 mm)[2] Intake 3" (80 mm)[3] 3" × 1.5" (80 × 38.1 mm)The termination shall be at least 4 ft (1,220 mm) for the U.S. and 6 ft (1,830 mm) for Canada away from a gas utility gauge, service regulator or the like (for non sealed combustion applications only).

NOTICE:▶ Consult local and state codes pertaining to special

building code and fire department requirements. Adhere to national code requirements.

NOTICE:▶ Observe the listed maximum lengths of vent system,

which are boiler model dependent. The maximum permissible lengths are listed in table 4, page 18.

72150200-19.1TD

2

1

3

4

5

72150200-27.1TD

1

32

4

72150200-20.1TD

2

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15

The termination shall terminate at least 4 ft (1,220 mm) below, 4 ft (1,220 mm) horizontally from, or 1 ft (305 mm) above any door, window, or gravity air inlet into any building.Vent must be at least 12 inches (305 mm) above grade, anticipated snow line or roof surface (Canada 18'' (457 mm) minimum) ( fig. 20).

Fig. 20 Vent and air pipe position (1) of a sealed combustion system

[1] Intake[2] 12" (300 mm) minimum[3] 24" (610 mm) minimum[4] Exhaust

Vent termination must be at least 7 ft (2,135 mm) above a public walkway ( fig. 21).Vent must be 3 ft (915 mm) above any forced air intake within 10 ft (3,050 mm) ( fig. 21).Do not extend exposed vent pipe outside the building beyond recommended distance. Condensate could freeze and block vent pipe.Vent should terminate at least 3 ft (915 mm) away from adjacent outside walls, inside corners and 5 ft (1525 mm) below roof overhang ( fig. 21).It is not recommended to terminate vent above any door or window, condensate can freeze causing ice formations.It is allowed to use a chimney as a supply channel, only when there are no other boilers or fireplaces which are using the chimney also as air supply or drainage.

Fig. 21 Vent position of a system with combustion air supply from the room (non-room sealed)

[1] At least 1 ft (305 mm) above grade and snow line[2] Exhaust terminal must be at least 3 ft (915 mm) above forced air

inlet within 10 ft (3050 mm)[3] Forced air inlet[4] Gravity air Inlet

72150200-17.1TD

2

2 2

2

3

4

1

2

72150200-18.1TD

1'

3'

3'

1'

4'

4'

7'

4'

1'

3'

5'

(213

5 m

m)

(305

mm

)

(1220 mm)

(1525 mm)

(1220 mm)

(915 mm)

(915 mm)

(305

mm

)

(305

mm

)

(1220 mm)

(1220 mm)

3

1 42

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

6 Installation

16

All vent pipes must be glued, except for the flue gas adapter ( fig. 22, [1]) which is screwed into place and the first connection to the flue gas adapter ( fig. 22, [2]). Installed you can slide the pipe onto the adapter, properly supported and the exhaust pipe must be pitched a minimum of a ¼ inch per foot back to the boiler. This allows the condensate to drain away. Fix the screws ( fig. 22, [3]), this is obliged for Canada.

Fig. 22 Vent pipes

All combustion air and vent pipe materials and fittings must comply with the following:

Below are approved examples of vertical and horizontal venting installation

Fig. 23 Vertical parallel venting system (sealed combustion) - Situation 1

[1] Exhaust 3" (80 mm)[2] 10"- 0" min. (250 mm - 0 mm min.)[3] 24" min. (610 mm min.)[4] 12" (300 mm) over maximum snow level or 24" (600 mm)

whichever is greater[5] Intake 3" (80 mm)

Item Material United States CanadaVent or air pipe and fitting

PVC schedule 40 ANSI/ASTM D1785 CSA or BH Gas venting

systems, ULC S636 1) certified only

1) Components of the certified vent systems must not be interchanged with other vent systems or unlisted pipe fittings Plastic components, and specified primers and glues of the certified vent system must be from a single system manufacturer and not intermixed with other system manufacturer's vent system parts.

PVC-DWV ANSI/ASTM D2665CPVC schedule 40 ANSI/ASTM F441ABS-DWV schedule 40

ANSI/ASTM D2661

Pipe cement/primer

PVC ANSI/ASTM D2564CPVC ANSI/ASTM F493ABS ANSI/ASTM D2235

Table 3

NOTICE:▶ Use of cellular core PVC (ASTM F891), cellular core

CPVC, or Radel® (polyphenolsulfone) in venting systems shall be prohibited. Covering non-metallic vent pipe and fittings with thermal insulation shall be prohibited.

NOTICE:▶ A minimum clearance of 4 feet horizontally from and

in no case above and below, unless a 4-foot horizontal distance is maintained, from electric gauges, gas gauges, regulators and relief equipment.

72150200-16.1TD

2

3

1

NOTICE:▶ Use materials approved by the authority having

jurisdiction. In the absence of such authority, PVC and CPVC pipe must comply with ASTM D1785, F441 or D2665. Cement and primer must comply with ASTM D2564 or F493. For Canada, use CSA or ULC certified PVC or CPVC pipe, fittings and cement.

NOTICE:▶ Place pipe supports every 5 feet (1525 mm) of

horizontal run, beginning with support near boiler.

NOTICE:▶ Periodic cleaning of the vent terminal and air-intake

screens is mandatory.

72150200-21.1TD

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3

4

15

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6 Installation

17

Fig. 24 Horizontal venting system (sealed combustion) - Situation 2

[1] Exhaust 3" (80 mm)[2] 3" × 1.5" (80 × 38.1 mm)[3] Intake 3" (80 mm)

Fig. 25 Vertical parallel venting system (sealed combustion) - Situation 2

[1] Exhaust 3" (80 mm)[2] 12" (300 mm) over maximum snow level or 24" (600 mm)

whichever is greater[3] 24" min. (610 mm min.)[4] Intake 3" (80 mm)[5] 3" × 1.5" (80 × 38.1 mm)

Fig. 26 Horizontal parallel venting system (sealed combustion)

[1] Exhaust 3" (80 mm)[2] 12" minimum[3] Intake 3" (80 mm)[4] 12" (300 mm) minimum

Fig. 27 Vertical venting system (non sealed combustion only)

[1] 3" × 1.5" (80 × 38.1 mm)[2] Exhaust 3" (80 mm)[3] 10"- 0" min. (250 mm - 0 mm min.)[4] 12" (300 mm) over maximum snow level or 24" (600 mm)

whichever is greater[5] Intake

72150200-22.1TD

32

1

72150200-23.1TD

3

2

51 4

72150200-24.1TD

2

1

43

72150200-25.1TD

1

4

3

2

5

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

7 Electrical connections

18

Fig. 28 Vertical exhaust and horizontal intake venting system (sealed combustion)

[1] 3" × 1.5" (80 × 38.1 mm)[2] Exhaust 3" (80 mm)[3] 10"- 0" min. (250 mm - 0 mm min.)[4] 12" (300 mm) over maximum snow level or 24" (600 mm)

whichever is greater[5] Intake 3" (80 mm)Do not exceed the total equivalent venting length of 100 feet (30,480 mm) (GB142-24/30/45) and 60 feet (18,288 mm) (GB142-60) maximum requirement each for the intake and exhaust piping.See table 4 for the Friction Loss Equivalent in piping and fittings.

Example:When you end up using 3 x 45°-elbows and the concentric vent kit, then the total venting length may not exceed 88 feet (26.84 m) (GB142-24/30/45) or 48 feet (14.65 m) (GB142-60).3 x 45°-elbow = 3 x 3 ft (0.91 m) = 9 ft (2.73 m)concentric vent kit = 3 ft (0.91 m)Total friction loss equivalent =12 ft (3.64 m)Total venting length for this example is:GB142-24/30/45 = 100 ft (30.48 m) - 12 ft (3.64 m) = 88 feet (26.84 m)GB142-60 = 60 ft (18.29 m) - 12 ft (3.64 m) = 48 feet (14.65 m).

6.8 Conversion to PropaneTo convert the boiler to propane, following the instructions in the “Propane, Conversion Kit” Instruction manual. Available kits page 36 “Spare parts”, [43].

7 Electrical connectionsDevices such as pumps, outdoor sensor and 3-way valve are all connected to the external connection board.The electrical connections to the boiler must be made in accordance with all applicable local codes and the latest revision of the National Electrical Code, ANSI/NFPA-70.Installations should also conform with CSA C22. 1 Canadian Electrical Code Part 1 if installed in Canada.

7.1 External connection board connectionsMake all electrical connections inside the external connection box.▶ Remove the cover of the external connection box ( fig. 29).

Fig. 29 Removing the cover from the external connection box

Fittings or Piping Equivalentfeet m

45 degree elbow 3 0.9190 degree elbow 5 1.52plastic pipe per foot 1 0.30concentric vent kit 3 0.91

Table 4 Friction Loss Equivalent in piping and fittings

NOTICE: The minimum covering wall thickness is 1" (25 mm). The maximum covering wall thickness is 16" (406 mm).

72150200-26.1TD

1

4

3

2

5

CAUTION: Vent connectors serving appliances vented by natural draft shall not be connected into any portion of mechanical draft systems operating under positive pressure.

NOTICE:▶ For Direct venting properly reassemble and reseal

the vent and air-intake systems.

DANGER: Connecting incoming powerThe boiler must be electrically grounded in accordance with local codes, or in absence of local codes, with the National Electrical Code, ANSI/INFPA 70 and/or the CSA C22.1, Electrical Code.

72150200-28.1TD

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▶ Install a 120V cable to the boiler ( fig. 30, [1]).▶ Lead the cable through the cable guide ( fig. 30, [2]).

Fig. 30 External connection boardTerminals 1 – 6 ( fig. 31) are low-voltage connections and terminals 7 – 10 ( fig. 31) are 120 Volt connections.

Fig. 31 Connections to external connection board

[Pos] Abbr. Color Component[1] RC orange RC room controller connection or for an

AM10 or other module[2] FA blue Outdoor-temperature sensor[3] WA green Potential-free On/Off thermostat[4] FW gray DHW temperature sensor[5] EV red External switching contact, potential-free for

floor heating safety etc.[6] DWV green Connection for external 3-way valve[7] PK green Primary loop pump 120 V 60 Hz[8] PS gray DHW tank pump 120 V 60 Hz[9] PZ lilac DHW recirculating pump 120 V 60 Hz[10] Netz white Main power connection 120 V 60 Hz

RC terminalConnector for installation of an RC controller for indoor reset operation or a module like the AM10.

FA terminalThis is the terminal where you connect the outdoor temperature sensor. Only necessary for outdoor weather responsive operation.

WA terminalFor connection of a potential free thermostat or relay panel end switch.

FWConnection for an external DHW tank sensor.

EV terminal (external switching contact)This terminal can be used for example for the safety switch of floor heating. This protects the floor heating against too high boiler water temperatures (external manual reset high limit). The boiler is shut down when the external switching contact is opened.The normally closed contacts of a LWCO will shut down burner operation but allow the pump to continue to operate in case of a low water condition.

DWVTerminal for connection of an external 3-way valve (not used).

PKConnector for the primary loop pump 120 V 60 Hz.

PSConnector for the DHW tank pump 120 V 60 Hz.

PZConnector for the DHW recirculating pump 120 V 60 Hz.

NETZMain power connector 120 V 60 Hz (-15% +10%).

120-volt connections

CAUTION: RISK OF ELECTRIC SHOCK.Once the main power supply is on then there is 120V on terminals 7 – 10 (can only be used with the correct configuration of the control unit and specific system hydraulics), if the main switch of the BC10 basic controller is switched on.

72150200-29.1TD

1.2.

72150200-30.1TD

7 98 101 3 5

62 4 CAUTION: Make sure that the power consumption of each of the terminals 7 – 9 ( circuit diagram) does not exceed 250 W or 5 Amp.

CAUTION: Label all wires prior to disconnection when servicing. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)


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Fig. 32 Electric circuit diagram

72150200-31.1TD

4

32

1

12

31

23

P

67

54

12

3

12

3

LN

PE

LN

5

M

120

VA

C

1

45

12

4321

5 4 3 2 1 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

3 2 1

4 3 2 1

571

54 51 46 19 77 26 63 64 75 74 36 37 58 57 33 60 35 8 43 3416 158 1 15 16 13 1

Pin

12855P

in 8

1

Pin

16

Pin

1

KIM

24 VRAC

78 6 5 1234

582

PZGrid14 13NL

PENL

537923

Fan

unit

Gas

bur

ner

fittin

gTr

ansf

orm

er

Hot

surf

ace

igni

tor

16-p

ole

conn

ecto

r(1

20 V

AC

)

81-p

ole

conn

ecto

r(A

C 0

, 10,

24

and

120

V)

81-p

ole

conn

ecto

r

16-p

ole

conn

ecto

r

Con

nect

ion

box

UB

A 3

.0

Ionization

Ear

th

Pre

ssur

ese

nsor

Return sensor

Safety-temperature sensor

Supply sensor

Ope

ratin

g sw

itch

Ear

th

120

VA

CF

unct

ion

mod

ule

Mai

ns s

uppl

y12

0 V

AC

60

Hz

Circ

ulat

ing

pum

p12

0 V

AC

, max

. 250

VA

DH

W c

ircul

ator

120

VA

C, m

ax. 2

50 V

A

Boi

ler

circ

ulat

or12

0 V

AC

, max

. 250

VA

External connection for specialist servicing company

Ext

erna

l sw

itch

cont

act

Pot

entia

l-fre

e e.

g.fo

r flo

or h

eatin

gD

HW

sen

sor

On/

Off

tem

pera

ture

co

ntro

l, po

tent

ial-f

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door

-tem

pera

ture

sens

orM

odul

atin

g ro

om c

ontr

olle

r

BC

10 c

onne

ctor

Bus

Fun

ctio

n m

odul

e

Ext

erna

l 3-w

ay v

alve

white greengreylilac

120

VA

CF

unct

ion

mod

ule

2 1DWV

High Voltage

0 VAC24 VAC

10 VAC10 VAC

230 VAC230 VAC

24 VRAC

120 VAC

120 VAC120 VAC

120 VAC

white red grey blue orangegreen

PS PK

PENL PENL PENL

25 24 63 61EV FW WA FA RC

2 1 2 13 2 1 2 1 2 1

6 5

6 5

1234

1234

14

13

24

22

39

38

12

11

706162

2

55

1289081255227

237953

7649

1644

1745

696867

141213

PENL

LPEN

1011

9

L

N

374

65

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

8 Start-up procedure

21

8 Start-up procedureThere are several steps involved in starting up the boiler.

Fig. 3372150200-32.1TD

FOR YOUR SAFETY READ BEFORE OPERATINGWARNING: If you do not follow these instructionsexactly, a fire or explosion may result causingproperty damage, personal injury or loss of life.

OPERATING INSTRUCTION

TO TURN OFF GAS TO APPLIANCETurn off all the electric power to the appliance if service is to be perfrr ormed.Set the thermostat or other operating control to lowest setting.Close main gas shut off valve.3.

2.1.

A.

B.

C.

D.

This appliance does not have a pilot. It is equipped with an ignition devicewhich automatically lights the burner. Do not try to light the burner by hand.BEFORE OPERATING smell all around the appliance area for gas. Be sure tosmell next to the floor because some gas is heavier than air and will settle onthe floor.WHAT TO DO IF YOU SMELL GAS

Do not try to light any appliance.Do not touch any electric switch; do notuse any phone in your building.Immediately call your gas supplier from a neighbor's phone. Follow the gassupplier's instruction.If you cannot reach your gas supplier, call the fire department.

Use only your hand to push in or turn the gas control knob. Never use tools.If the knob will not push in or turn by hand, don't try to repair it, call a qualifiedservrr ice technician. Force or attempted repair may result in a fire or explosion.Do not use this appliance if any parts have been under water. Immediately call aqualified service technician to inspect the appliance and to replace any part ofthe control system and any gas control which has been under water.

•

•

••

If the appliance will not operate, follow the instruction "To Turn Off Gas ToAppliance" and call your service technician or gas supplier.

Turn on all electric power to the appliance.Set the thermostat or other operation control to desired setting.Open main shut off valve.

Wait (5) minutes to clear out any gas. Then smell for gas. Including near thefloor. If you smell gas, STOP! Follow "B" in the safety information above onthis label. If you don't smell gas, go to the next step.

Close main gas shut off valve.

This appliance is equipped with an ignition device whichautomatically lights the burner. Do not try to light the burner by hand.

Set the thermostat or other operating control to lowest setting.Turn offff all electric power to the appliance.STOP! read the safety information above on this label.

10.9.8.7.

6.5.

4.3.2.1.

708.375A - 2172B

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)


22

8.1 Testing for gas leaksPrior to start-up of the boiler you must check the external tightness of the gas supply valve and confirm this in the start-up report.

▶ Disconnect the heating system from the power supply.▶ Check the exterior tightness of new conduit sections up to and

including the direct sealing point on the gas burner fitting. The maximum test pressure allowed on the input of the gas burner fitting is 14 inch W.C. (35 mbar).

8.2 Filling the boilerSet the main switch to “1” a. [p/0.0| appears in the display of the BC10 telling you that there is no system pressure.▶ Fill the heating system to a pressure of around 20 psi (1.5 bar).

▶ Observe the pressure on the BC10 or the P/T gauge in the pump manifold for the heating circuit. The fill pressure of the system should be at least the required inlet pressure for the expansion tank plus 7.2 psi (0.5 bar). The minimum pressure is 15 psi (1.0 bar) (on a cold system). The maximum pressure is 44 psi (3.0 bar) (if the heating medium temperature is at its highest possible level). If this pressure is exceeded, the pressure relief valve will open.

For first time start up it is necessary to set the DHW temperature knob h and the space heating water temperature knob i to the desired setting ( 9.3.2 and 9.3.3). Factory setting is “0”.

8.3 Filling the condensate trap▶ Make sure that you fill the condensate trap with water. This is to

prevent exhaust gases from entering the room.▶ Remove the condensate trap ( fig. 34) by disconnecting the

connection to the heat exchanger and the connection to the condensate bypass pipe.

Fig. 34 Filling water into the condensate trap

▶ Fill with water and refit the condensate trap in reverse order.

8.4 Bleeding the gas supply valve▶ Loosen the screw plug on the testing nipple for the gas connection

and venting ( fig. 35, [1]) by two turns and fit a hose.

Fig. 35 Bleeding the gas supply conduit

▶ Slowly open the gas shut-off valve.▶ Run the gas that is discharged through a water bath.▶ Close the gas shut-off valve when no more air is released.▶ Remove the hose and tighten the screw plug again.

8.5 Checking the combustion air/flue gas connectionCheck the following points:▶ Is the prescribed combustion air/flue system used?▶ Have the instructions for configuring the flue system as specified in

the relevant Installation instruction for the flue gas system been observed?

8.6 Checking the orifices

WARNING: ▶ Cover endangered positions before leak testing.▶ Do not spray the leak testing agent onto cables, plugs

or electrical connection lines. Do not allow it to drip onto them either.

DANGER: Leaks may be caused to pipes and screw connections during commissioning and maintenance activities.▶ Carry out a proper leak test.▶ Only use approved leak detection agents for leak

detection.

NOTICE: ▶ Observe the space heating water requirements as

described in paragraph 1.4 on page 4.

NOTICE: If a relief valve discharges periodically, this may be due to thermal expansion in a closed water supply system.▶ Contact the water supplier or local plumbing

inspector on how to correct the situation. Never plug the relief valve.

WARNING: There is a hot water scald potential if the BC10 is set too high.

WARNING: Danger of fatal accident due to poisoning.If the condensate trap is not filled with water, flue gas can escape and put people's lives at risk.

CAUTION: The burner must only be commissioned if the correct orifices are fitted ( table 5).▶ Convert the burner fitting to another gas type if

required ( chapter 6.8 “Conversion to Propane”, page 18).

72150200-33.1TD

72150200-34.1TD

1

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)


23

8.7 Inlet gas pressure▶ Connect the pressure gauge connection hose ( fig. 36, [2]) to the

testing nipple ( fig. 36, [1]).

Fig. 36 Measuring the inlet gas pressure

[1] Testing nipple[2] Pressure gauge connection hose▶ Slowly open the gas shut-off valve.The boiler and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of ½ psi (3.5 kPa).The boiler must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than ½ psi (3.5 kPa).▶ Briefly press on the control panel cover to open it.

Fig. 37 Opening the control panel

▶ Switch on the heating system by setting the main switch to position “1” a( chapter 9 “BC10 basic controller”, page 25).

▶ Press the “Chimney Sweep” d button and hold it (for approx. 2 seconds) until the display shows a decimal point.

▶ Measure the gas connection pressure as soon as the “Burner” LED g lights and enter this value in the start-up report.

The inlet gas pressure must be:• for natural gas - min. 3.5 to 10.5 inch W.C (8.7 to 26.1 mbar),

nominal supply pressure 7.0 inch W.C. (17,4 mbar)• for LPG - min. 8.0 to 13.0 inch W.C. (19.9 to 32.3 mbar), nominal

supply pressure 11.0 inch W.C. (27.4 mbar).▶ Repeatedly press the “Service” e button until the temperature

indication is displayed.▶ Press the “Chimney Sweep” d button to end the measurement

procedure.▶ Close the gas shut-off valve.▶ Remove the connection hose again and tighten the screw plug on the

testing nipple.▶ Open the gas shut-off valve again.

8.8 Checking and adjusting the gas/air ratio▶ Switch off the heating system using the main switch b.▶ Loosen the screw plug on the measuring nipple for the burner

pressure by 2 rotations ( fig. 38, [1]).

Fig. 38 Checking the gas/air ratio

[1] Burner pressure measuring nipple[2] Pressure gauge connection hose▶ Set the pressure gauge to zero.▶ Use a hose to connect the plus terminal of the pressure gauge to the

burner pressure measuring nipple ( fig. 38, [1]).▶ Switch on the heating system using the main switch a.▶ Press the “Chimney Sweep” d button and hold it (for approx. two

seconds) until the display shows the decimal point.▶ Press and hold the “Chimney Sweep” d and “Service” e buttons

(for approx. five seconds) until the display shows “Lxx” (e. g. L80).

Boiler capacity

Type of gas supply

Gas orifice diameterAltitude 0-10,200 ft

No CO2-correction Altitude 4,001-10,200 ft

with CO2-correctioninch mm inch mm

24 kW Natural gas 0.175 4.45 0.179 4.55LPG P 0.132 3.35 0.134 3.40




Table 5 Gas orifice diameter

72150200-35.1TD

2

1

72150200-36.1TD

CAUTION: ▶ Contact the relevant gas utility company if the

required inlet gas pressure is not available.▶ Install a gas pressure regulator before the gas burner

fitting if the supply pressure is too high.

1

2

72150200-51.1TD

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)


24

▶ Set the boiler to partial load “L30” by pressing the “Chimney Sweep” d button (higher values) or the “Reset” c button (lower values).

▶ Read out the differential pressure. The differential pressure (pGas – pAir) must be -0.02 inch W.C. (- 5 Pa) (±0.02 inch W.C. = ± 5 Pa) (read-out on pressure gauge: -0.04 – 0 inch W.C. = -10 – 0 Pa).

▶ Enter the value measured in the start-up report.▶ If the gas/air ratio is not correct it can be adjusted using the

adjustment screw ( fig. 39, [1]). The adjustment screw is located behind the cover screw.

Fig. 39 Setting the gas/air ratio

▶ Repeatedly press the “Service” e button until the temperature indication is displayed.

▶ Press the “Chimney Sweep” d button until the decimal point is cleared from the display.

▶ Switch off the heating system using the main switch.▶ Remove the measurement set-up, tighten the screw in the burner

pressure measuring nipple.▶ Switch on the heating system using the main switch a.

8.9 Carrying out a leak test in operating conditions▶ Check all gaskets and joints in the burner gas circuit for leaks while

the burner is operational, using a foaming agent.

8.10 Measuring the carbon monoxide content (CO)▶ Measure the carbon monoxide content on the flue gas sampling point

( fig. 40).

Fig. 40 Flue gas sampling pointThe CO values in an air-free condition must be below 400 ppm or 0.04 vol. %. Values of 400 ppm and up indicate that the burner adjustment may be wrong, the gas burner fitting or the heat exchanger are dirty or that there may be burner faults.▶ You must establish and resolve the cause. The boiler must be

operational when you do this.

8.11 Function testing▶ You must check the functioning and, if readjustment is possible, the

adjustment of all control, regulating and safety devices when carrying out start-up tests, annual inspections or maintenance as required.

▶ You must also test the gas and water lines for leaks.

8.12 Measuring the ionization current▶ Switch off the heating system using the main switch b.▶ Disconnect the plug and socket connection of the monitoring cable

and connect the measuring device in series ( fig. 41). Select the μA direct current range on the measuring device. The measuring device must have a resolution of at least 1 μA.

Fig. 41 Measuring the ionization current

DANGER: Leaks may be caused to pipes and screw connections during start-up activities if flammable gas explodes.▶ Only use approved leak detection agents for leak

detection such as a soapy water solution.

CAUTION: due to a short circuit.▶ Cover damageable parts before leak testing.▶ Do not spray the leak testing agent onto cables, plugs

or electrical connection lines. Do not allow it to drip onto them either.

72150200-37.1TD

1

72150200-38.1TD

72150200-39.1TD

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

9 BC10 basic controller

25

▶ Switch on the heating system using the main switch a.▶ Press the “Chimney Sweep” d button and hold it (for approx. two

seconds), until the display shows the decimal point.▶ Press and hold the “Chimney Sweep” d and “Service” e buttons,

until the display shows “Lxx” (e. g. L80).▶ Set the boiler to partial load “L30” by pressing the “Chimney Sweep”

d button (higher values) or the “Reset” c button (lower values).▶ Measure the ionization current. When the boiler is in partial load

mode the ionization current must be > 5 μA DC.▶ Enter the value measured in the start-up report.▶ Repeatedly press the “Service” e button, until the temperature

indication is displayed.▶ Press the “Chimney Sweep” d button to end the measurement

procedure.▶ Switch off the heating system using the main switch b.▶ Remove the measuring device and restore the plug and socket

connection.▶ Switch on the heating system again using the main switch a.▶ Push against the drawer ( fig. 42) to close the control panel.

Fig. 42 Closing the control panel

8.13 Testing the Ignition Safety shut off device▶ Switch off the heating system using the main switch b.▶ Disconnect the plug and socket connection of the monitoring cable.▶ Switch on the heating system using the main switch a.▶ Press the “Chimney Sweep” d button and hold it (for approx.

2 seconds), until the display shows the decimal point.▶ Check if the boiler does one start-up attempt and three restart

attempts.After each start-up attempt the boiler will signal a start-up failure. A “6A” (= [6/a//|) code can be seen in the display.After the last start-up attempt, the boiler will lock out. The “6A” (= [6/a//|) code is blinking in the display.▶ Connect the plug and socket connection of the monitoring cable.▶ Press the reset button.▶ Check if the boiler starts-up.▶ Press the “Chimney Sweep” button return to normal operating

conditions.

8.14 Installing the casing▶ Install the casing and close the latches ( fig. 43). Do not lift the

casing by the latches.▶ Lock the latches using the radiator key.

Fig. 43 Installing the casing

8.15 Informing the owner, handing over the technical documents

▶ Show the owner how the heating system works and how the boiler can be operated. Hand over the technical documents.


9.1 Operating the BC10 basic controller

Fig. 44 BC10 basic controller – Controls

[1] Main switch[2] DHW temperature knob[3] LED “DHW status”[4] Display[5] Space heating water temperature knob[6] LED “Heating system status”[7] Under the cover a RC system controller can be installed (not

available).[8] LED “Burner Operation”[9] Service Tool connector[10] “Service” e button[11] “Chimney sweep” d button[12] “Reset” c button

72150200-40.1TD

72150200-41.1TD

72150200-52.1TD

190

170

150

130

90

110

140

130

120

90

100110

54 6 2 3

712 11 10 91 8

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)


26

9.1.1 Switching the heating system on and off

Switching on the heating system▶ Set the main switch a on the BC10 basic controller to position “1”

(On).

Switching off the heating system▶ Set the main switch b on the BC10 basic controller to position “0”

(Off).

9.1.2 Displaying the operating conditions of the burner and resetting the burner or resetting burner faults

Displaying the operating conditions of the burnerThe LED g indicates the operating condition of the burner.

Resetting the boiler or resetting faultsIf the boiler is down due to a fault, you can reset the boiler by pressing the “Reset” c button. This is only possible for so-called lock-out faults. There is another type of fault, so-called blocking faults, that reset themselves when the cause has been remedied.▶ Press the “Reset” c button to reset the boiler.The display shows “rE” [\/r/e| while resetting. It is only possible to reset the boiler when a lock-out code (blinking fault code) is visible in the display.

9.1.3 Displaying the heating system status and/or faultsThe display of the BC10 basic controller shows the status of the heating system.In the event of a fault the display immediately shows the fault or the warning in the form of an error code ( section 13.2). The status display will flash if the fault is a lock-out fault.▶ Press the “Service” e button to switch between status displays or

to read out the service and error codes.▶ Resolve the fault section 13.3.

The following status displays can be seen depending on the operating conditions:

LED Condition ExplanationOn Burner operational The water in the boiler is being heated.Off Burner off The water in the boiler has reached the

required temperature or there is no heat request.

Table 6 LED indication

NOTICE:▶ If the burner returns to fault mode after resetting the

boiler, you must resolve the fault using the servicing section in this document. Contact your supplier if necessary.

Displays (examples) Values Meaning Operating condition/Remedy[1/4/0| 1) number 0 … 199 2) Current boiler water temperature (in °F) Normal operating conditionsp [p/2/1| > P15 Current system pressure (in psi)q [-/h/\|[p/1/2|[h/\/7|

1)

(changing)P3 … P12 Warning:

System pressure is too low (between 3 and 12 psi = 0.2 and 0.8 bar)

WarningHeating system remains operational between 12 psi and 3 psi (0.8 and 0.2 bar).▶ Fill the heating system and restore the minimum

filling pressure (≥ 14.5 psi = ≥ 1.0 bar).The system pressure is shown for 10 minutes after which the standard display returns.

p [-/h/\|p [1/4/0| number 0 … 199 2) Current boiler water temperature (in °F)q [p/1/2| P3 … P12 Current system pressure (in psi)

[p/3/\| 1) (flashing)

< P3 Fault: system pressure is far too low (< 3 psi = < 0.2 bar)

FaultBurner and boiler circuit pump are not operational. Frost protection is active up to 2 psi (0.1 bar).The heating system will only become operational again if the pressure is back to 14.5 psi (1.0 bar).▶ Fill the heating system and restore the minimum

filling pressure (≥ 14.5 psi = ≥ 1.0 bar).The system pressure is shown for 10 minutes after which the standard display returns.

p [2/0/7| number > 200 Error codeRemedy the error see servicing section

p [1/4/0| number 0 … 199 2) Current boiler water temperature (in °F)q [p/3/\| < P3 Current system pressure (in psi)

[3/a/\| 1) (partially flashing)

Combination of letters and digits

Service code FaultLock-out faults (flashing display) must be reset by pressing the “Reset” c button.Blocking faults reset automatically as soon as the cause has been removed.Remedy any blocking faults that remain active for a long time using the service section in this manual.

p [2/0/7| number > 199 Error codeRemedy the error using the servicing section in this manual

p [1/4/0| number 0 … 199 2) Current boiler water temperature (in °F)q [p/2/1| > P15 Current system pressure (in psi)

Table 7 Possible status displays

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)


27

9.2 Carrying out additional tasks

9.2.1 Carrying out a flue gas testThe “Chimney Sweep” d button is used for the flue gas test.The heating control system works at the maximum flow temperature for 30 minutes. This is set on the BC10 basic controller using the “maximum heater temperature” knob. During flue gas testing the decimal point lights up in the display.▶ Press and hold the “Chimney Sweep” d button (< 5 seconds) until

the decimal point is displayed.▶ Carry out the flue gas test.▶ Press the “Chimney Sweep” d button to interrupt the flue gas test.

9.2.2 Selecting partial load operation (e. g. during flue gas testing)

You can operate the boiler at a reduced boiler capacity during flue gas testing. This reduction is only effective for the duration of the flue gas test.▶ Press the “Chimney Sweep” d button (max. 2 seconds) until the

decimal point shows in the status display. This will switch on the flue gas test.

▶ Press and hold the “Chimney Sweep” d and “Service” e buttons (for approx. 5 seconds) to enter the partial load mode.

▶ Press the “Reset” c button to reduce the boiler capacity percentage.

Example: boiler capacity reduced to 50 % (= [l/5/0]) of the rated boiler capacity.▶ Press the “Chimney Sweep” d button to increase the boiler

capacity percentage.▶ When test is completed, press the “Service” e button until the

temperature indication is displayed.▶ Press the “Chimney Sweep” d button until the decimal point is

cleared from the display.

9.2.3 Switching the heating system to manual modeIn manual mode the heating system can be operated independently of an external control unit. The boiler is operated with the heating system temperature set on the right knob serving as the target value.A blinking decimal point is displayed while manual mode is active.▶ Press the “Chimney Sweep” d button (for more than 5 seconds)

until the decimal point in the status display flashes.▶ Turn the knob i to set the maximum space heating system

temperature.▶ Press the “Chimney Sweep” d button to exit manual mode.

9.3 Configuring the boiler

9.3.1 Adjusting the heating capacitySetting the heating capacity depending on the maximum heat requirement ( table 8).

▶ Press and hold the “Chimney Sweep” d and “Service” e buttons until an “L” with a double-digit value (e. g. L80) or an “L” followed by two dashes (L - -) is displayed. Factory setting “L- -”(= [l/-/-|).

▶ Set the heating capacity by pressing the “Chimney Sweep” d button (higher values) or the “Reset” c button (lower values).

▶ Press the “Service” e button to confirm the setting.

[a/1/2| A00 … A99 Service code System faultsSystem faults are faults in the heating system that do not affect the burner number > 800 operation.

p [8/1/6| number > 800 Error codeRemedy the error using the service section in this manual

p [-/h/\|p [1/4/0| number 0 … 199 Current boiler water temperature (in °F)q [p/2/1| > P15 Current system pressure (in psi)[\/-/\| (flashing) Fault

No communication between BC10 and automatic gas burner.

FaultRemedy the error using the service section in this manual.▶ Check the connections to both devices.▶ Check the communication lines.

1) Standard display for this operating condition. This display appears after 5 minutes if no button is pressed.2) The temperature is higher as 199° when 199 is blinking in the display

Displays (examples) Values Meaning Operating condition/Remedy

Table 7 Possible status displays

WARNING: ▶ Turn the “space heating system temperature” i

knob to limit the heating system temperature to the permissible flow temperature for the floor heating circuit (e. g. 86 – 104 °F = 30 – 40 °C), so pipes will not overheat.

DANGER: The heating system can freeze up if a power failure occurs or after switching off the power supply, because manual operation then is no longer active.▶ You must re-activate manual operation after

switching on the system to keep the heating system operational (especially if there is a risk of frost).

Regu-lator setting in %

Heating capacity (±5 %, sea level1))

1) For use at high altitude the capacity decreases with 3% for every 1000 feet.

boiler cap. 24 kW

boiler cap. 30 kW

boiler cap. 45 kW

boiler cap. 60 kW

kW btu kW btu kW btu kW btuL30 7.2 24,566 8.7 29,684 13.5 46,062 18.0 61,542L40 9.6 32,755 11.7 39,920 18.0 61,416 24.0 82,080L50 12.0 40,944 14.8 50,498 24.5 83,619 30.0 102,630L60 14.4 49,133 17.8 60,734 27.0 92,178 36.0 123,192L70 16.8 57,322 20.9 71,311 31.5 107,573 42.0 143,766L80 19.2 65,510 23.9 81,547 36.0 122,976 48.0 164,352L90 21.6 73,699 27.0 92,124 40.5 138,389 54.0 184,950L-- 24.0 81,888 30.0 102,360 45.0 153,810 60.0 205,560

Table 8 Heating capacity

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

10 Shutting down the system

28

9.3.2 Setting the DHW temperature value▶ Turn the “DHW temperature” h rotary knob to set the desired

temperature of the hot water in the hot-water tank.

9.3.3 Entering the space heating water temperature▶ Turn the “space heating water temperature” i knob to set the

upper limit value of the heater water for the heating operation. This limitation does not apply to DHW preparation.

9.3.4 Setting the pump post-purge periodA pump must be connected to PK ( fig. 31, [7]) of the external connection board in order to be able to set the pump run over time.

▶ Press and hold the “Chimney Sweep” d and “Service” e buttons until the display shows “L- -”(= [l/-/-|).

▶ Press the “Service” e button. The display shows “F05”. The heating system has been factory-set to a pump post-purge period of 5 minutes.

▶ Press the “Chimney Sweep” d or “Reset” c buttons to set the pump post-purge period. The pump post-purge period can be set from 5 – 60 minutes (F 5 – F60) or to 24 hours (F1d).

▶ Press the “Service” e button to confirm the setting.

10 Shutting down the system

10.1 Shut down the heating system using the control unitShut down your heating system using the BC10 basic controller. When the BC10 basic controller is shut down, the burner is also switched off automatically. Further information on how to operate the BC10 basic controller can be found in chapter 9 “BC10 basic controller”, page 25.▶ Switch off the heating system using the main switch b.▶ Close the main shut-off valve or the gas shut-off valve.

10.2 Shutting down the heating system in the event of an emergency

You must immediately close the main shut-off valve or gas shut-off valve and disconnect the power from the heating system.▶ Close the main shut-off valve.

Condition Explanation LED0 Off No hot water supply (only heating

mode).Off

Eco 1)

1) This function has been optimized for boilers with combined DHW heating (combi-units).

Economy mode, Hot water temperature 2) 140 °F (60 °C)

2) The heating program (timer) of the room control unit remains active, as a result of which no hot water is heated during night-time operation.

The DHW will only be reheated to 140 °F (60 °C), if the temperature has significantly fallen. This reduces the number of burner starts and saves energy. As a result the water may be a bit colder initially.

On 3)

3) The heating program (timer) of the room control unit remains active, as a result of which no hot water is heated during night-time operation.

86 – 140 Direct setting on BC10 2) in °F

The temperature set on the BC10 is a temperature that cannot be changed using a RC thermostat.

On 3)

Aut Entry via thermostat 2) (presetting)

The temperature is set on the thermostat (e. g. RC30). If no thermostat is connected, the maximum DHW temperature is 140 °F (60 °C).

On 3)

Table 9 Settings of “DHW temperature” knob

Condition Explanation LED0 Off No supply to heating system (only

DHW heating operation).Off

86 – 190 Direct setting on BC10 in °F (86 – 190 °F = 30 – 90 °C)

The temperature set on the BC10 is a temperature that cannot be changed using a RC thermostat. Supply temperature does not rise above the set temperature.

On 1)

1) The LED under the rotary knob lights up when the heating system is switched on and heat is requested. In summer mode the heating system is switched off (LED off).

Aut Entry via thermostat (presetting)

The temperature is automatically determined on the basis of the heating characteristic. If no thermostat is connected, the maximum heater temperature is 190 °F (90 °C).

On 1)

Table 10 Settings of “space heating water temperature” rotary knob

CAUTION: ▶ Set the boiler primary pump post-purge period to

24 hours if the heating system is controlled by room temperature sensor and there is a risk of parts of the heating system that are outside the coverage of the room thermostat freezing (e. g. radiators in a garage; constant circulation).

NOTICE:▶ On thermostat only systems a 5 to 10 minute post-

purge setting is recommended to purge heat from the boiler.

DANGER: The heating system may freeze if it is not operational in times of frost. Protect the heating system against freezing if there is a danger of frost affecting the system. Drain the heating system water from the lowest point of the heating system. The vent screw at the highest point of the heating system must then be open.

DANGER: Should overheating occur or gas supply fail to shut off, turn off the manual gas control valve to the boiler.

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

11 Inspection

29

11 InspectionWe advise you to offer your customer an annual inspection and maintenance contract (for the contents of this contract, page 35 and page 35).If inspection reveals that maintenance work is necessary you can carry this out as required ( chapter 12 “Maintenance”, page 29).

▶ Periodically examine the venting systems and cleaning of the screens in the vent terminal.

▶ Also periodically inspect the low water cutoffs, including flushing of float types and clean the condensate collections and disposal system.

11.1 Preparing the boiler for inspection▶ Switch off the heating system using the main switch b.▶ Remove the cover from the boiler ( fig. 7, page 9).

11.2 Visual inspection for general signs of corrosion▶ Check all gas and water pipes for signs of corrosion.▶ Replace any pipes that are corroded.

11.3 Internal leak testing▶ Switch off the heating system using the main switch b.▶ Test for internal leaks of the gas burner fitting on the inlet side,

applying a test pressure of 7.0 inch W.C. (17.4 mbar) in case of natural gas and 11.0 mbar (27.4 mbar) in case of LPG.

After one minute the pressure must not have dropped by more than 3.8 inch W.C. (10 mbar).▶ If the pressure has dropped more, you must check all gaskets and

joints upstream of the gas burner fitting for leaks using a foaming agent. Repeat the pressure test if no leaks are found. If the pressure has again dropped by more than 3.8 inch W.C. (10 mbar) per minute you will have to replace the gas burner fitting.

11.4 Measuring the ionization currentSee section 8.12“Measuring the ionization current” page 24.

11.5 Measuring the inlet gas pressureSee section 8.7“Inlet gas pressure”, page 23.

11.6 Checking and adjusting the gas/air ratioSee section 8.8“Checking and adjusting the gas/air ratio”, page 23.

11.7 Carrying out a gas leak test in operating conditionsSee section 8.9“Carrying out a leak test in operating conditions”, page 24.

11.8 Measuring the carbon monoxide content (CO)See section 8.10“Measuring the carbon monoxide content (CO)”, page 24.

11.9 Carrying out a pressure test of the heating systemSee chapter 8“Start-up procedure”, page 21.

11.10 Checking the functioning and the safety of the air intake and flue gas conduit

See section 8.5“Checking the combustion air/flue gas connection”, page 22.

11.11 Checking venting systemsCheck air intake and flue gas for obstruction or damage.

12 Maintenance

▶ Switch off the heating system using the main switch b.▶ Close the gas shut-off valve.▶ Remove the casing.

12.1 Cleaning the heat exchanger, burner and condensate trap

▶ Dismantle the hot surface ignitor and the ionization electrode.▶ Loosen the fastening nuts ( fig 45, [1]).▶ Remove the earth cable ( fig 45, [2]).▶ Remove the retaining plate.▶ Pull the hot surface ignitor ( fig 45, [3]) and the ionization

electrode ( fig 45, [4]) out of the heat exchanger.

Fig. 45 Removing the hot surface ignitor and the ionization electrode

[1] Fastening nut[2] Earth cable[3] Hot surface ignitor[4] Ionization electrode

CAUTION: ▶ Check and clean the heating system once a year.▶ Carry out a maintenance overhaul if necessary.

Immediately repair defects to avoid damage to the heating system!

WARNING: Do not use this boiler if any part has been under water. Immediately call a qualified service technician to inspect the boiler and to replace any part of the control system and any gas control which has been under water.

CAUTION: Risk of electric shock.▶ Before opening the system: disconnect the heating

system from the power supply using the heating system emergency OFF button or disconnect the relevant circuit breaker of the house from the power grid.

▶ Secure the heating system against accidental restarting.

INSTRUCTION FOR THE INSTALLER▶ If gas pipes have to be disconnected from the gas

burner fitting, the burner cover must only be opened by a specialized professional.

CAUTION: There is no need to lubricate the combustion motor as it is permanently lubricated.

CAUTION: To avoid a short circuit.▶ Do not spray the cleaning agent onto the burner, the

hot surface ignitor, the ionization electrode or other electric components.

72150200-42.1TD

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Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

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▶ Loosen the threaded connection to the gas control valve ( fig 46, [1]) and pull the plug ( fig 46, [2]) from the gas valve terminal block.

▶ Pull the plug from the fan unit ( fig 46, [3]).▶ Loosen both sets of retaining clips ( fig 46, [4] and [5]) of the

burner cover and remove the burner cover with the fan unit and the gas burner fitting ( fig 47, [1]).

Fig. 46 Removing the connections

[1] Gas control valve[2] Plug[3] Fan unit[4] Retaining clip heat exchanger[5] Retaining clip burner▶ Remove the gas/air distributor plate ( fig 47, [2]), the orifice plate

(GB142-24, GB142-30 and GB142-60 only, fig 47, [3]) and the burner ( fig 47, [4]). Note that the orifice plate of the GB142-60 has a different shape.

▶ Clean the gas/air distributor plate, the orifice plate (GB142-24, GB142-30 and GB142-60 only) and the burner using compressed air.

Fig. 47 Cleaning the burner cover, gas/air distributor plate, orifice plate and burner

[1] Gas burner fitting[2] Gas/air distributor plate[3] Orifice plate[4] Burner

▶ Remove the baffle plate and clean it using compressed air ( fig 48).

Fig. 48 Baffle plate▶ Flush the heat exchanger with water ( fig. 49).

Fig. 49 Cleaning the heat exchanger

▶ Re-assemble all parts in reverse order of disassembly.

▶ Switch on the heating system using the main switch a.▶ Press the “Chimney Sweep” d button until the decimal point is

displayed. Leave the boiler on for approx. 10 minutes.▶ Switch off the heating system using the main switch b.▶ Dismantle the boiler again and flush the heat exchanger with water.▶ Pull the condensate trap from the condensate plate ( fig 50, [1]).▶ Pull the internal condensate bypass pipe from the condensate trap

( fig 50, [2]).

72150200-43.1TD

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NOTICE:▶ It is important to inspect and properly replace the

rubber gaskets.

72150200-45.1TD

72150200-46.1TD

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

13 Appendix

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▶ Loosen the condensate trap from the connection ( fig 50, [3]) and remove it.

Fig. 50 Condensate trap▶ Use a bristle brush to clean the condensate trap.▶ Flush the condensate trap.▶ Fill the condensate trap with water before re-installing it.▶ Check the condensate trap gasket for damage and replace it if

necessary.▶ Re-assemble all parts in reverse order of disassembly.

12.2 Checking and adjusting the gas/air-ratioSee section 8.8“Checking and adjusting the gas/air ratio”, page 23.

13 Appendix

13.1 Operating messages▶ Press the “Service” e button a number of times to switch between

the various status displays.

72150200-47.1TD

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3.

2. Display MeaningNormal mode =/-[-/h//| Boiler in space heating mode 1)

1) “- H” May also appear when the boiler is in frost protection mode. There has been a continuous DHW demand and CH request for more then one hour. The boiler then switches to CH mode. The operating code flashing in the display after the service button is pressed is A01/ 818. To enable the DHW, restart the boiler.

[=/h//| Boiler in DHW heating modeNormal mode 0[0/a//| Burner interval circuit, burner will start

automatically after 10 minutes[0/c//| Burner is started[0/e//| More capacity was delivered than required[0/h//| Standby[0/l//| Gas burner fitting is opened[0/u//| Initializing/ pre purge[0/y//| Flow temperature higher than setTest mode -[-/a./| Dot displayed in right hand bottom corner

Boiler in flue gas test

Manual mode -[-/h.}Blinking dot in right hand bottom corner

Boiler in manual mode

Reset[r/e//| Reset (after holding the “Reset” c button

for 5 seconds, the heating system is returned to its switch-on condition)

Table 11 Normal operating messages

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

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13.2 Error messages▶ Press the “Service” e button to display the service code (e. g.

“3A”).▶ Press the “Service” e button to display the error code (e. g. “207”).The error message is a combination of the service code (e. g. “3A”) and the error code (e. g. “207”). You can only resolve the error message using the Service chapter in this manual.

INSTRUCTION FOR INSTALLERS▶ The display may also show system faults (e. g. “A11”).

In principle, they are identified by the initial letter “A” and they refer to faults between the boiler and the additionally available electronic components.

Display Meaning2 Water flow / water pressure

E 207 System pressure too low < 3 psi (0.2 bar).F 271 Temperature difference between safety and supply

sensors too much or no temperature increase after starting the burner.

L 266 Test of pump operation via a pressure increase in the heating system (during pump start).

P Temperature increase of safety sensor or supply sensor too high.

U Temperature difference between supply and return sensor too much.

Y Pump feedback fault.3 Fan speed

A 264 Fan unit failed during operation.C 217 Fan unit is running too fast.F 273 Continuous 24 hour operation.L 214 Fan shut down during security test.P 216 Fan unit is running too slowly.Y 215 Fan unit is running too fast.

4 TemperaturesA 218 Supply sensor over 220 °F (105 °C).E 278 Sensor test failedF 219 The safety temperature sensor has detected a flow

temperature of over 266 °F (130 °C)L 220 Safety sensor affected by short circuit or higher than

266 °F (130 °C).P 221 Loose contact or defective safety sensor.U 222 Supply sensor affected by short circuit.Y 223 Loose contact or faulty supply sensor.

6 Flame monitoringA 227 No ionization message after ignition.C 228 Ionization measured before burner start.L 306 The flame went out during the heating phase.P 229 Hot-surface ignitor on for too long.

7 Grid voltageC 261 The grid power was interrupted after an error.L 261

280UBA fault.

8 External switching contactY External switching contact, e. g. temperature safety

switch for floor heating, has taken place.Table 12

9 System faultsA 235 Communication fault between UBA and KIM.H 237

267 272

UBA fault.

P 239 UBA fault.L 234

238 239

Faulty gas burner fitting cable connection.

U 233 KIM out of order.Y Communication fault between BC10 basic controller

and UBA.E System faults

1, A, C, F, H, L,

Y

Internal UBA fault.

Display Meaning

Table 12

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

13 Appendix

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13.3 Technical specificationsGeneral specifications unit boiler cap. 24 kW boiler cap. 30 kW boiler cap. 45 kW boiler cap. 60 kWGas category Natural gas Natural gas Natural gas Natural gasRated thermal load for Natural gas btu/hr 25,700 – 84,800 31,800 – 106,000 46,000 – 160,900 66,000 – 214,800Rated heating capacity for heating curve 176/140 °F (80/60 °C)

btu/hr 22,700 – 75,200 28,100 – 91,500 40,600 – 142,200 58,200 – 189,800

Rated heating capacity for heating curve 122/86 °F (50/30 °C)

btu/hr 25,300 – 83,300 30,700 – 102,400 45,100 – 158,500 64,800 – 211,600

Boiler efficiency rating max. capacity for heating curve 176/140 °F (80/60 °C) 1)

1) The performance information shown is based on 'European performance standards'.

% 88 88 88 88

Boiler efficiency rating max. capacity for heating curve 122/86 °F (50/30 °C) 1)

% 97 97 97 97

CSA Output btu/hr 76,300 95,400 144,800 178,900HeatingMax. flow temperature °F (°C) 194 (90) 194 (90) 194 (90) 194 (90)Heater water temperature °F(°C) 86 –190 (30–90),

can be set on BC10 basic controller

86 –190 (30–90), can be set on BC10

basic controller

86 –190 (30–90), can be set on BC10

basic controller

86 –190 (30–90), can be set on BC10

basic controllerMaximum operating overpressure of boiler psi (bar) 43.5 (3) 43.5 (3) 58 (4) 58 (4)Heating exchanger heating circuit volume gallons (l) 0.7 (2.5) 0.7 (2.5) 1.0 (3.6) 1.3 (4.7)Pipe connectionsGas connection inch ¾ '' NPT ¾ '' NPT ¾ '' NPT ¾ '' NPTHeating system water connection inch (mm) 1.0'' NPT (25.4) 1.0'' NPT (25.4) 1.0'' NPT (25.4) 1.0'' NPT (25.4)Condensate water connection inch (mm) Ø 1.3'' (Ø 32) Ø 1.3'' (Ø 32) Ø 1.3'' (Ø 32) Ø 1.3'' (Ø 32)Flue gas valuesCondensate water quantity for natural gas G20, 104/86 °F (40/30 °C)

gallons per hour

2.6 3.3 4.7 7.1

pH value condensate water pH approx. 4.1 approx. 4.1 approx. 4.1 approx. 4.1Flue gas mass flow rate at full load g/s 10.0 12.6 19.4 25.9Flue gas temperature 176/140 °F (80/60 °C), full load

°F(°C) 150 (66) 167 (75) 150 (66) 150 (66)

Flue gas temperature 176/140 °F (80/60 °C), partial load

°F(°C) 135 (57) 137 (58) 135 (57) 135 (57)

Flue gas temperature 122/86 °F (50/30 °C), full load

°F(°C) 113 (45) 118 (48) 96 (36) 96 (36)

Flue gas temperature 122/86 °F (50/30 °C), partial load

°F(°C) 91 (33) 91 (33) 91 (33) 91 (33)

CO2 content, full load, natural gas G20 % 9.2 9.2 9.3 9.3CO2 content, full load, LPG G31, propane % 10.0 10.0 10.0 10.0Standard emission factor CO mg/kWh ≤ 15 ≤ 15 2)

2) If the heating capacity is limited to max. 80 % (L80).

≤ 15 ≤ 15Standard emissions factor NOx mg/kWh ≤ 20 ≤ 20 2) ≤ 20 ≤ 20Free fan feed pressure inch w.c. (Pa) up to 0.023

(up to 60)up to 0.039 (up to 100)

up to 0.054 (up to 140)

up to 0.054 (up to 140)

Flue gas connectionØ Flue system, dependent on the air in the room

inch (mm) 3 (80) 3 (80) 3 (80) 3 (80)

Ø Flue gas system, independent of the air in the room

inch (mm) 3/3 (80/80) parallel

3/3 (80/80) parallel



Electric dataMains voltage (-15%, +10%) V, Hz 120, 60 120, 60 120, 60 120, 60Fuses amps 5 amps 120 V

slow blow5 amps 120 V



slow blowElectrical protection rating IP X4D IP X4D IP X4D IP X4DElectrical power consumption, at full load W 96 117 64 82Electrical power consumption, at partial load W 22 22 20 22Boiler dimensions and weightHeight × Width × Depth inch (mm) 28 x 22 x 18.7

(712 x 560 x 475)28 x 22 x 18.7

(712 x 560 x 475)28 x 35.4 x 18.7

(712 x 900 x 475)28 x 35.4 x 18.7

(712 x 900 x 475)Weight lbs (kg) 110 (50) 110 (50) 143 (65) 158 (72)

Table 13 Technical specifications

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

14 Reports

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▶ The gas orifice diameter is marked on the gas orifice (in mm).▶ The venturi article number is marked on both clips of the venturi

( fig. 51, [1]).

Fig. 51 Venturi article number

14 Reports

14.1 Start-up reportPut your signature and the date at the bottom of the start-up report.

Type of gas supply Factory pre-setting of the gas control valveNatural gas Delivered factory-set: Natural GasLPG P Suitable for propane after conversion

( chapter “Conversion to Propane”).Information on gas type instruction plate: Set to gas category: Propane.

Table 14 Factory setting of the gas control valve

72150200-48.1TD

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Boiler capacity

Type of gas supply

Venturi article

number

Gas orifice diameter Altitude 0 - 10,200 ft

No CO2 correction

Altitude 4,001 - 10,200 ft

with CO2 correction

[inch] [mm] [inch] [mm]24 kW Natural gas H 423.072A 0.175 4.45 0.179 4.55

LPG P 423.072A 0.132 3.35 0.134 3.4030 kW Natural gas H 423.072A 0.175 4.45 0.177 4.50



LPG P 423.173A 0.213 5.40 0.215 5.45Table 15 Gas orifice diameter

Start-up activities Page Measured values Remarks1. Fill the heating system and check that all connections are tight

• Inlet pressure of expansion tank (observe the Installation Instructions for the expansion tank)

• Pressurize the system• Fill the condensate trap

21

2121

_____________ psi

_____________ psi

2. Carry out a gas tightness test 213. Note down the gas characteristics: Wobbe index

Operating heat value21 _____________ kWh/m3

_____________ kWh/m3

4. Convert the boiler to another type of gas supply (only if allowed)

5. Vent the gas supply conduit 22

6. Check the combustion air/flue gas connection 22

7. Measure the gas connection pressure (flow pressure) 23 ____________ inch W.C.8. Check and adjust the gas/air ratio 23 ____________ inch W.C.9. Measure the carbon monoxide content (CO) 24 _____________ ppm10. Check and if necessary adjust the carbon monoxide content (CO2) _____________ %11. Measuring the ionization current 24 _____________ mA12. Make the necessary settings on the thermostat 25

13. Carry out function testing 24

14. Fitting the casing 25

15. Inform the owner; hand over the technical documents 25

Confirm proper start-up

Company stamp/signature/dateTable 16

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

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14.2 Inspection report▶ Please indicate the inspection activities that you have carried out and enter the values measured.

14.3 Maintenance report▶ Sign for the maintenance activities that you have carried out and enter the date.

Inspection activities Page Date: __________ Date: __________ Date: __________

1. Test the general condition of the heating system

2. Carry out a visual inspection and test the functions of the heating system

3. Test all gas and water conduits and fittings for:• their tightness during operation• visible corrosion• signs of aging• fill the condensate trap

2929

22

4. Check the burner, the heat exchanger and the condensate trap for pollution. First shut down the heating system

29

5. Check the burner and the ignition and ionization electrodes.First shut down the heating system

29

6. Measure the ionization current 24 ____________ mA ____________ mA ____________ mA7. Measure the gas connection pressure (flow pressure) 23 ____________ psi ____________ psi ____________ psi8. Check the gas/air ratio 23 ______ inch W.C. ______ inch W.C. ______ inch W.C.9. Carry out a gas tightness test in operating conditions 29

10. Measure the carbon monoxide content (CO) 29 ____________ % ____________ % ____________ %

11. Check the water pressure of the heating system• Inlet pressure of expansion tank (also see the Installation Instructions for

the expansion tank)• Filling pressure.

____________ psi____________ psi

____________ psi____________ psi

____________ psi____________ psi

12. Check the operation and safety of the air intake and flue pipe 22

13. Check that the thermostat is set in line with the needs (see documents with thermostat)

25

14. Final check of inspection activities, note down the measurement and test results

15. Confirm proper inspection

Company stamp/signature



Table 17

Needs-dependent maintenance activities Page Date: __________ Date: __________1. Clean the burner, the heat exchanger and the condensate trap. First shut down the

heating system29

2. Check and adjust the gas/air ratioCO2 content with full loadCO2 content with partial load

23 _____________ inch W.C._____________ %_____________ %

_____________ inch W.C._____________ %_____________ %

Confirm proper maintenance



Table 18

Logamax plus GB142-24/30/45/60 – 6720820104 (2017/10)

15 Spare parts

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15 Spare partsBelow is a list of the spare parts for this boiler. Look up the position number in the exploded view drawing on the next 2 pages for the illustration. Spare parts may be ordered from Buderus.

Pos. Description Product No.1 Casing 24/30 kW 7099988

Casing 45/60 kW 70999012 Casing latches left (2 pc) 70990393 Casing latches right (2 pc) 70990383 Casing seal 24/30 kW 70987524 Casing seal 45/60 kW 70987985 Wall mounting bracket 70983646 Back panel 24/30 kW 7099001

Back panel 45/60 kW 70999037 Cap air vent 71002509 Seal ring Ø 3'' 871860071910 Seal ring Ø 80 mm 709647511 Flue gas collector 709885712 Oval seal 709885813 Heat exchanger 24/30 kW 7746900159

Heat exchanger 45 kW 7746900160Heat exchanger 60 kW 7746900161

14 Heat exchanger baffle 24/30 kW 709882815 Seal condensate collector 24/30 kW 7098834

Seal condensate collector 45 kW 7098838Seal condensate collector 60 kW 67900522

16 Condensate collector + sealing 24/30 kW 7098840Condensate collector + sealing 45 kW 7098844Condensate collector + sealing 60 kW 67900521

17 Clamp 709884818 Sensor NTC 710013619 Revision set air vent 1) 709882220 Sight glass 709857521 Burner box 24/30 kW 7099057

Burner box 45 kW 7098875Burner box 60 kW 67900525

22 Safety sensor 7819423 Seal burner 24/30 kW 7098916

Seal burner 45 kW 7098920Seal burner 60 kW 67900526

24 Gas/air distribution plate 24/30 kW 7100922Gas/air distribution plate 45 kW 7098926Gas/air distribution plate 60 kW 67900527

25 Orifice plate 24/30 kW 7100920Orifice plate 45 kW 7098832Orifice plate 60 kW 67900523

26 Burner 24/30 kW 7099003Burner 45 kW 7098932Burner 60 kW 67900528

27 Gas-air inlet 709900428 Seal fan 709902329 Ionization electrode 7819530 Hot surface ignitor 709900631 Shield hot surface ignitor 7100229

Table 19

32 Mounting plate 709885233 Seal mounting plate (5 pc) 709885034 Air inlet pipe; 24/30 kW 7099024

Air inlet pipe; 45/60 kW 709992335 Seal Ø50 mm (5 pc) 709905836 Venturi 24/30 kW 7099020

Venturi 45 kW 7099925Venturi 60 kW 7099931

37 Seal set (4 pc) 709902138 Fan 7818439 Gas control valve 24/30/45 kW 7746900891

Gas control valve 60 kW 773670020340 Gas supply pipe GB142 USA 7668541 Spring (5 pc) 710054942 Seal 2x16x22 (5 pc) 709877843 L.P. Orifice Ø 3.35 - 24/30 kW 0-10,200 ft 76687

L.P. Orifice Ø 3.40 - 24/30 kW 4,001-10,200 ft

7746901353

L.P. Orifice Ø 4.15 - 45 kW 0-10,200 ft 7746901355N.G. Orifice Ø 4.45 - 24/30 kW 0-10,200 ft 7099016N.G. Orifice Ø 4.50 - 30 kW 4,001-10,200 ft 7746901421N.G. Orifice Ø 4.55 - 24 kW 4,001-10,200 ft 7746901354N.G. Orifice Ø 5.40 - 45 kW 0-10,200 ft 76690L.P. Orifice Ø 5.40 - 60 kW 0-10,200 ft 76690L.P. Orifice Ø 5.45 - 60 kW 4,001-10,200 ft 7746901357N.G. Orifice Ø 5.55 - 45 kW 4,001-10,200 ft 7746901356N.G. Orifice Ø 7.50 - 60 kW 0-10,200 ft 76686N.G. Orifice Ø 7.65 - 60 kW 4,001-10,200 ft 7746901358

44 Condensate trap, part of pos. 88 871860068945 Seal condensate trap (5 pc) 710074246 Supply pipe CH; 24/30/45 kW 7599047 Supply pipe CH; 60 kW 7599148 Return pipe 24/30/45 kW 7099965

Return pipe 60 kW 70994549 Pressure sensor 1) 871860001950 Bottom plate 709904951 Transformer 120V 7819152 Grommet 709905053 External connection board 7381454 External connection board cover 709904655 Fuse 5 AF slow blow 73904s56 UBA cover 709904757 UBA3 - 120V 871860008358 Drawer 709904359 Drawer front 709903760 Controller connection plate 7818661 On/off switch 709904162 Controller cover 7369863 Boiler ident. module 24 kW 78223

Boiler ident. module 30 kW 78224Boiler ident. module 45 kW 78225Boiler ident. module 60 kW 7736700204

64 Cable harness low voltage 7819365 Cable harness high voltage 7099957

Pos. Description Product No.

Table 19

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66 O-ring (10 pc) 38434s67 Sealing bush (set) 709900268 Cable harness of on/off switch 709907269 Cable harness BX holder 709907070 Fuse holder 3834571 Seal Ø60 mm (5 pc) 709887872 O-ring set orifice 709901873 Seal (5 pc) 871860004574 Set screw M5x20 (5 pc) 709906575 Cap 24/30 kW 7910576 Double nipple THR x COMPR 7597777 Cable saddle (10 pc) 709881078 Bolt M6x16 (2 pc) 709907879 Clip pressure sensor 710137080 Drain plug 709936481 Cap connection piece 3849882 Clip (5 pc) 73651s83 Centering ring (5 pc) 73480s84 Coupling nut pump 73481s85 Seal pump (10 pc) 15022s86 Coupling nut pump 1502087 Conversion set pump 7314988 Flue gas adaptor drain set, incl. pos. 44 871860068689 Flue gas silencer 24/30/45 kW 7099056

1) not shown in exploded views

Pos. Description Product No.

Table 19

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Exploded view Logamax plus GB142-24/30

Fig. 52

72150200-49.1TD

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34

27 31

30

29

28

74

74

23

17

17

19

10

11

12

9

88

7

48

20

45

16

14

15

47

18

5

6

67

35

36 37

72 43

3973

40

4142

58

50

5153

65

64

54

52

5662

57

60

61

59

63

1322

38

26

25

24

21

68

74

71

69

75

76

76

49

70

55

66

66

8485

85

83

86

87

77

78

8281

79

80

44

88

89

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Exploded view Logamax plus GB142-45/60

Fig. 53

72150200-50.1TD

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2

3

4

3332

34

27 31

30

29

28

74

74

23

24

25

26

17

17

1910

11

12

9

88

7

48

20

16

14

15

47

185

6

67

67

3536

37

72 43

3973

40

4142

58

50

5763

60

61

59

56

54

51

64

5253

65

13

22

38

69

62

68

74

2171

49

55

70

66

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66

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8586

87

8280

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Documents

Installation instructions Condensing gas boiler Logamax plus...Condensing gas boiler Logamax plus CAUTION! Before putting the boiler into oper ation read this manual carefully. DANGER!